Joseph A. Jakubowski, 32, is wanted in connection with the burglary April 4, 2017, of the Armageddon gun shop in Janesville where more than a dozen high-end weapons were taken.
The burglary happened shortly after police say Jakubowski penned a 161-page anti-government manifesto and sent it to President Donald Trump.
Police say they learned that Jakubowski has made threats to local authorities and churches, leading to extra security at schools, churches and government offices in southern Wisconsin.
Special Agent in Charge Justin Tolomeo of the Federal Bureau of Investigation Milwaukee Division announced today, April 11, 2017, the FBI has increased its reward up to $20,000.
Investigators say Jakubowski may have attempted to alter his appearance by shaving all facial hair and his head. They released a photo enhancement of what he might now look like.
More than 150 law enforcement personnel and others are working jointly on the investigation.
"We have increased the reward appealing to those in the public who may be able to assist us in a safe and peaceful resolution for all concerned," said SAC Tolomeo.
The public is reminded to remain vigilant and report any suspicious activity, or sightings of Jakubowski to law enforcement.
Please contact the FBI's tip line 1-800-CALL-FBI (1-800-225-5324), or tips.fbi.gov
Agencies currently assisting in the search include:
Rock County Sheriff's Office
Janesville Police Department
Bureau of Alcohol Tobacco and Firearms (ATF)
Wisconsin Division of Criminal Investigation
United States Capitol Police
United States Secret Service
United States Postal Inspector
Beloit Police Department
Clinton Police Department
Dane County Sheriff's Office
Wisconsin State Patrol
U.S. Customs and Border Patrol
Beloit Fire Department
Janesville Fire Department
Milton Fire Department
Southwest Emergency Preparedness Team
Southwest Incident Management Team
Beloit Emergency Management
Dane County Emergency Management
City of Beloit Administration
Rock County Board of Supervisors
Rock County 911 Communications Center
Rock County Information Technology Department
Rock County Planning DepartmentRock County Facilities Management Department